Question

the total cost of 8 books and 5 Pens is 420 rupees and the total cost of 5 books and 8 pens is 321 rupees find the cost of 1 book and 2 pens ​

Answer 1

Step-by-step explanation:

8b+5p=420

5b+8p=321

3b -3p =99

b-p =33

B= 33+ p

5(33+p)+8p=321

165+5p +8p=321

13p=321-165

13p=156

P= 12

therefore price of one pen is 12₹

hence price of 2 pens is 24 ₹

and as b=33+p

b=33+12

b=45

price of one book is 45₹